What's the difference between mRNA and pre-mRNA? It's all about splicing of introns. See how one RNA sequence can exist in nearly 40,000 different forms. Next, the snRNPs U2 and U4/U6 appear to ...

To explore the evolution and function of introns in eukaryotes, we have developed an intron sequence information system (ISIS; http://isis.bit.uq.edu.au/) which ...